Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8203404d75df71…

MALICIOUS

PDF

35.4 KB Created: 2020-08-13 21:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad70882b06046d7e40146cacf851d9e SHA-1: fffbd13a2f7b1752cc432b36ec8972052fd6bc08 SHA-256: ba8203404d75df71443b6919fb7da4fed4d4297296a36609428b78a632033175
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains embedded links to a known malicious redirector. The document body and embedded URLs suggest a tactic of creating a link farm, likely for SEO poisoning or to obscure the true malicious destination. The primary malicious URL identified is https://ttraff.com/pify?keyword=buy+linen+sheets+canada, which is used to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=buy+linen+sheets+canada
    • http://files.rtsbowlingstore.com/uploads/1/3/1/4/131483154/8348015.pdf
    • http://fekiturup.myyogajourney.co.uk/uploads/1/3/1/6/131637041/cf5a0afb6ad.pdf
    • http://zutagova.janiferwheeler.com/uploads/1/3/1/6/131637836/refofasobuvebek.pdf
    • http://zitetani.amplifytalentsolutions.com/uploads/1/3/0/7/130776699/japobowovegakixewiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/26329239039.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/silowadawuvosel.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6727/files/dakalupepikasaro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9822/6329/files/vosozowidoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/7165/9414/files/62517331928.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8281/files/23023143226.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7641/files/45089131340.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0435/6902/1089/files/senotusimufoxixelo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/86018826657.pdf
    • https://cdn.shopify.com/s/files/1/0432/9806/2501/files/nejibafek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/falexof.pdf
    • https://cdn.shopify.com/s/files/1/0429/7805/0201/files/45339759053.pdf
    • https://cdn.shopify.com/s/files/1/0432/2200/7965/files/benim_hocam_2020_kpss_ders_notlar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004af7.bin
439af5431cf4b550d4bc3f85f340bb53acc708433f0fccb7c1f251cc54fd37f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF7 5080 bytes
font_01_sfnt_off00005c3e.bin
a3ec3fd0009e27a8336d989c2c31206b1f1d47285ea5e28c189e7f12a8bfb638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3E 10740 bytes

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